Canadian Citizen who wants to Work in U.S For a Summer.

So yeah, basically I'm a canadian citizen, going to med school in England this October, but I would like to establish some connections next couple summers in the U.S (would like to eventually do residency in the U.S)

Therefore, I would like to have summer employment (paid job) in a research lab. Is this feasible/realistic? What type of Visa would I need? Work Permit?